Question about 1999 Cadillac DeVille
Air lock in the system
have it professionally bled out at a radiator shop
Posted on Dec 28, 2017
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Posted on Jan 02, 2017
SOURCE: im receiving a check coolant
No the light is linked to a sensor. There is a coolent sensor that tells you that the level is low. It sounds like the sensor has gone bad. And the sensor is located in the coolent tank. If it is bad from my understanding you have to replace the whole tank. But take a paper clip with the engine off and disconnect the wire harness from the sensor and jump the wires and see if the light goes off.
Posted on Jan 20, 2009
SOURCE: 99 Cadillac Deville Coolant Leak
Most likely a cracked block or free plug that came out or loose. Other options are hozes, which I believe the dealer would have fixed. A third option is the water pump itself.
Posted on May 06, 2009
SOURCE: 99 deville head gasket leak?
A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.
Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.
Check cooling fans are operating ok (as necessary when car warms up):- if not check
2) relay operation,
3) heat sensor switch.
Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.
Posted on Sep 21, 2009
Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
Posted on Apr 16, 2010
SOURCE: COOLANT LEAKS ONLY WHEN CAR
From the way you describe it, It is likely the pressure cap on the surge tank (expansion/overflow coolant tank).
It is probably worn and no longer able to hold the pressure.
The cap is an inexpensive replacement so do this first.
Posted on Sep 14, 2010
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